Telegraph-transmitter apparatus.



I 'H. a. DAVIS. TELEGRAPH TRANSMITTER APPARATUS.

APPLICATION IILED'OOT. 18, 1q09.

Patented Dec. 13, 1910.

1 'lransmitter Apparatus,

1 UNITED STATES PATENT OFFICE.

HARRY G. DAVIS, OF WILLIAMSPORT, PENNSYLVANIA, ASSIGNOR TO ELECTRICPRESS BULLETIN COMPANY, OF WILLIAMSPORT, PENNSYLVANIA, A CORPORATION OFDELAWARE Specification-of Letters Patent.

TELEGRAPH-TRANSMITTER APPARATUS.

Patented Dec. 13, 1910.

Application filed October 18, 1909. Serial No. 623,189.

To all whom it may concern:

citizen of the UnitedStates, and resident of \Vdliamspor-t, Lycomincounty, State of Pennsylvania, have ma e certaln newand usefulInventions Relatin to Telegraphlowing is a speci cation, taken inconnection with the accompanying drawings,'forn11ng part of the same.

' This invention relates to telegraph transmitter apparatus and relatesespecially to transmitting apparatus for actuating'telegraph printers ofthe type described in the application of Campbell and Davis, 162,059,filed November 11, 1908. r v

In the accompanying drawings showing in a somewhat diagrammatic manneran illustrative embodiment of this invention. Figure 1 is a transversesectional viewof the transmitter; Fig. 2 is a longitudinal sectionthereof; Fig. 3 is a detailed plan view showing the unison arm mounting.

In the illustrative embodiment of this invention shown in the drawingsthe transmitter may comprise the pin drum 1 rigidly mounted on the driveshaft 54 which may ,be rotated through the frictional drive clutch 47 orother devices giving a slight torque and allowing slip when the drum isheld against rotation. A spirally arranged series of pins 2 are mountedon the drum so as to cooperate with a corresponding se ries of latches 3mounted on the latch pin 20 .at'the upper end of the latch arms 9carried at either end of the latch shaft 10 as indicated in Fig. 1. Theseries of keys 4 5 may be arranged as in a regular typewriter keyboardandpivoted about the key pin T-in the frame member 8. The latches may beconnected with the keys in any desired way as by the stirrups (5 looselyconnecting each latch with its corresponding key which of coursenormally held in raised inoperative position-by suitable light wire 17and is adapted to engage the contact 14 connected to the,wire 18 whenthe lug is pressed backward by any latch being brought into engagementwith the pin on which the fol-' the drum which tends torotate asindicated by the arrow.

The usual unison thread 43 may be mounted on the drive shaft 54 asindicated in Fig. 2 and be engaged by a suitable pin on the unison arm28 which'also carries the unison stud 26 for engagement with :1corresponding stud on the unison crank 56 mounted on the drive shaft. Asindicated in Fig. 1 this umison arm 28 is pivotally secured'to the stud29 and is provided with an inclined cam surface with which thecooperating releasing cam 35on the printing lever 31 is adapted toengage so to raise this unison arm out of cooperation with the unisonthread and allow it to swing back into its initial position at the rightof this thread in Fig. 2 as is usual so that every time one of thelatches comes into engagement and dinal movement by a suitableescapcment bar 33 mounted by the brackets 41 on the rod 34 and engagingthe collar (31 on the type wheel, so that the spring 4 2 shown in dottedlines in Fig. 2 normally tends to draw this eseapement bar and typewheelto the right, its n'iovement being limited by the usual typewriterescapement pawls 32nvhich feed the type wheel forward one spacewhenevc'r the printing lever 31 is oscillated. This printing levercarries the printing bar 36 which is adapted to bring the paper sheet 37into en agement with the characters on the type wieel 39 so as to printtherefrom, the characters being of course inked by any suitable inkingdevlce not shown.

A suitable unison lever 23 may be mounted as indicated in Fig. 1 tocooperate with the end of the unison arm 28 when this arm. has beenmoved to its extreme position in which the stud 2Q engages the unisoncrank 56 indicated in Figs. 1 and 2, and locks after arm 28 has beenmoved a predetermined distance sufiicient for instance toallow the drumshaft to make one more revolution. Under these conditions the unisonlock or bar 21 supported on the arms 22 is rigidly held belease of theunison arm from ILS extreme operative position. As is indicated in Fig.2, however,-the lock 21 does not project under the unison key 5 so thatthis key may under these conditions be readily depressed, throwing downthe unison latch 38 so that its inclined or cam surface 103 engages thecorresponding unison pin on the stationary drum,

as is indicated in Fig. 1, thus wedging back the latch arms 9 andactuating the contacts and other devices described.

The interrupter or commutator segments 44, 45 may as indicated, bemounted on the drive shaft 54 and electrically energized by the brushes50, 51 engaging the sleeves 146, 46 respectively so as to positivelyoralega tively energize the contacts 44, 45 from the batteries or othersources of electricity 48, 49. The corresponding brushes 144 and 145 aresimilarly energized by their engagement with the commutator segments 44,45 to send out the alternating electrical impulses over the lines to thevarious controller and printing devices at the receiving stations. Thesealternating impulses normally pass through.

the transmitter resistance 52 so as to transmit moderate selectiveimpulses to the vari- '30 ous selector devices at the receiving station,but when the latch arms are forced back by engagement of any of thelatches with the pin drum the contacts 14, 16 are brought intoengagement and. complete the shunt circuit through the connected wires17, 18, so that a stronger actuating impulse may thus be transmitted tothe receiving device. This stronger actuating impulse may as indicatedin Fig. 2 operate a suitable signal device, such as the signal lamp 53connected with each line leading to the corresponding receivingdevicewhich ma Y comprise a releasing resistance or other means for reducing,-

the current strength and correspondingly affecting the signal device atthe sending station when the printing operation is com pleted in themachine connected with that particular line.

It is of course understood that any number of controller and printingdevices at different stations may be connected to the same 'transmitterthrough similar actuating contacts 16 which areoperated by thesan'iclatch lug or projection 19, these actuating contacts being similarlycrmrmcted -with corresponding signal la mps and transmitter resistancesand with the same or similar interrupter-s 'on the drive shaft 54.

If desired a suitable cushioning device may be connected with the latchto minimize undesira ble impact'when the. transmitter is rapidlyoperated. This cushioning device may as indicated in Fig. l comprise asuitable pneumatic cylinder 9.6 mounted on the frame and provided Withthe. adjustable position, so that in this way the desired amount ofpneumatic cushioning action may be secured as the latch member is thrownback by. the pin 'drum..

Havlng described this invention in connection with an illustrativeembodiment thereof, to the details of which disclosure the invention isnot of course to be limited, what is claimed as new and what is desiredto be secured by Letters Patent is set'forth in the appended claims.

1. In telegraphtransmitter apparatus, a frictionally operated driveshaft and connected pin drum, a series of pins on said drum, a latchshaft, latch arms connected to said latch, shaft, a latch pin connectedto said latch arms, a series of latches mounted erativ'ely connectedwith said latches, a unison device operated by said drive shaft andcomprising a unison arm, a unison lock in the path of said characterkeys, a connected unison lever in the path of said unison arm and heldagainst movement when saidfunison device is in actuating position, aunison key, a connected unison latchhaving a cam surface coEJ'pera-tingwith a unison pin on said drum, a pneumatic cushioning cylinder havingan adjustable throttling valve cooperating with one of said latch arms,a

spring pressed piston in said cylinder normally engaging said latch armsto cushion the same, a latchlug-mounted on one of said latch arms, anelectrical actuating contact in cotiperating with said latch lug to beclosed thereby when said latches are 'a tuated, a type wheel connectedwith said drive shaft, printing devices cooperating with said type wheelactuated by one of said latch-arms, means including an interruptermounted on said driveshaft to generate alternating electrical impulses,a trans mitter resistance through which said impulses nori'nally pass tothe line and a signal and actuatii'ig circuit comprising a signal lampand said actuating contact in shunt around said .transi-i'iitter'resistance;

2. ln telegraph transn'iitter apparatus, a frictionally operated driveshaft and corn nected pin drum, :1 series of pins on said drum, a latchshaft, latch. arms connected to said latch shaft, a latch pin connectedto said latch arms, a series of latches mounted on said latch pin andcoiiperating with the corresponding pins on sa1ddrum,'a correspondingseries of. character keys loosely. connected with said latches, a unisondevice operated by said drive shaftand comprising;

in the path of sand unison arm and held against movement when saidunison device 1s 1n actuating position, a unison key, a connected unisonlatch having a cam. surface cooperating with a unison pin on said drum,a latch lug mountedon one of said latch arms, a'resllient electricalactuating contact in cotiperation with said latch lug to be closedthereby when said latches are actuated, a type Wheel slidingly mountedon said drive shaft, a printer bar and printing lever connected with andactuated by one of said latch arms, a feed device for said type wheelcontrolled by said printing lever. means comprising an interruptermounted on said drive shaft to generate alternating electrical impulses,a transmitter resistance through which'said impulses normally pass tothe line'and a signal and actuating circuit comprising a signal lamp andsaid actuating contact in shunt around said transmitter resistance. i

3. In telegraph transmitter apparatus, a

normally operated drive shaft and connected pin drum. a series of pinson said drum, a latch shaft, a latch arm connected to said latch shatt,a latclupin connected to said latch arm, a series of latches mounted onsaid latch pin and cooperating with the cor; responding pins on saiddrum, a corresponding series of character keys connected with saidlatches, a unison device connected to said drive shaft and comprising aunison arm, a unison lock in the path of said character keys having'aconnected unison lever in the path of said unison arm and held againstmovement when said unison device is in actuating position, a unison key,a connected unison latch having an actuating member cooperating with aunison pin on said drum, an electrical actuating contact cooperatingwith said latch arm to be closed thereby when said latches are actuated.means comprisingan interrupter connected with said drive shaft togenerate electrical impulses. a transmitter resistance through whichsaid impulses normally pass to the line. a signal and actiulting circuitcomprising a-signal lamp and said actuating contact in shunt around saidtransmitter resistance.

4. In telegraph transmitter apparatus, a normally operated drive shaftand connect ed pin drum, a series of pins on said drum. a movablymounted latch arm, a latch pin connected to saidplatch arm, a series oflatches mounted on said latch pin and cooperating with the correspondingpins on said drum, a corresponding series of character keys looselyconnected with said latches,

Mon arm held against movement; whensaid unison device is in actuatingposition, a unison key, a connected unison, latch havlng a cam surfacecooperating with a unison pin on said drum, an clectrical actuating contact cooperating with said latch arm to be closed thereby when saidlatches are actuated, means comprising an interrupter -C0llnected tosaid drive shaft to generate electrical impulses, a transmitterresistance through which said impulses normally pass to the line and asignal and actuating circuit comprising'a signal device and saidactuating contact connected in shunt around Si1i( transmitterresistance.

-In telegraph transmitter apparatus, a pin drum, a series of pins onsaid drum, a latch device and latches connected to said latch device andcooperating with the corresponding pins on said drum, a correspondingseries of keys connected with said latches. a pneumatic cushioningdevice connected with said latch device, an electrical actuatingcontact. in cooperation with said latch device to be operated therebywhen said latches are actuated, means comprising an interrupterconnected with said pin drum, to generate electrical impulses, a

transmitter resistance through which said impulses pass to the line anda signal and actuating circuit comprising a signal device and saidactuating contact connected in shunt around said transmitter resistance.6. In telegraph transmitter apparatus, a pin drum provided with pins, alatch device, latches connected to said latch device and cooperatingwith the corresponding pins on said drum, means to operate said latches.a cushioning device connected to said latch device, an electricalactuating contact cooperating with said latch device to be closedthereby when said latches are actuated and an interrupter connected withsaid pin drum and said actuating contact.

7.'In telegraph transmitter,apparatus, a pin drum, latches and a latchdevice coopcrating with said pin drum, a pneumatic cushioning deviceconnected with said latch device, an actuating contact cooperating withsaid latch device to be operated thereby when said latches are operatedand means comprising an interrupter connected with said pin drum andsaid actuating contact to generate electrical impulses.

8. In telegraph transmitter apparatus, a pin drum. a series of pins onsaid drum, a latch device, latches connected to said latch device andcooperating with thecorres'ponding pins on said drum, a correspondingseries of keys connected with said latches, an electrical actuatingcontact in cooperation with said latch device to be closed thereby whensaid latches are actuated, means comprising an interrupter connectedwith'said pin drum to generate electrical impulses, a

impulses pass to the line and a signal and actuating circuitcoinprisin'g a signal deviceand said actuating contact connected inshunt around said transmitter resistance.

7 9.111 telegraph. transmitter apparatus, a. pin drum, a series of pinson said drum, a latcl'i devic-e, latches connected to said latch device,aseries oi keys connectedwith said latches, an electrical contactcooperating with said latch device to beclosed thereby when. saidlatches are actuated, means conr prising aninterrupter connected'withsaid pin drum to generate electrical impulses, a transmitter resistancethrough which said impulses 'normally'pass to the line and a signal anda'ctuatingcircuit comprising a signal device and said actuating contacteonnected in'shunt around said transmitter resistance.

10.111 telegraph transmitter apparatus, a pin' drum provided with pins,a series of keys and latches cooperating with said pin drum, anelectrical. actuating contact and means to close said contact when saidlatches are'actuated, means comprising an interrupter connected \Vltllsaid pin drum to generate electrical impulses, a transmitter resistancethrough Which said impulsesnormally pass to the line and a signal andactuating circuit comprising a signal. deviceand said actuating contactconnected in shunt around said transmitter resistance.

11-. In telegraph transmitter apparatus. a

electrical actuating contact coiiperating with i said latch device to beclosed thereby when said latches are actuated, means comprising aninterrupter connected with asid pin drum to generate electrical impulsesand a signal and actuating circuit comprising asignal device and saidactuating contact totransmit stronger electrical impulses to thelinewhen said-actuating contact is operated.

12'. In telegraph transmitter apparatus, a pin drum provided with pins,a latch device and a connected series of keys and latches cooperatingwith said pin drum, an electrical actuating contact cooperating withsaidiatch device, a cushioning device eooperating with said latch deviceto cushion its action, means comprising'an interrupter connected withsaidpin drum to generate electrical impulses and a signal and a'ctuat-'ing circuit comprising a signal device and said actuating contact'totransmit'stronger electrical nnpulses to'the line when said actuatingcontact 1s operated.

transmitter resistance through which said '13. In telegraph transmitterapparatus, a

pin drum provided with pins, a latch device and a connected series-ofkeys and latches cooperating with said pin drum, an electrical actuatingcontact cooperating With said latch device to he closed thereby Whensaid latches are actuated, apneumatic cushioning device cooperating withsaid'latch device, means comprising an interrupter connected with saidpin drum to generate electrical impulses and asignal and actuatingcircuit comprising a signal device and said actuating contact'totransmit stronger electrical impulses to the line when said actuatingcontact is operated.

14.. In telegraph transmitter apparatus, a I

pin drum provided with pine, a latch device and a connected series of hes and latches cooperating With said pin rum, an electrical. actuatingcontact coiiperatin'g With said latch device to be closed thereby Whensaid latches are actuated, a pneumatic cushioning cylinder having anadjustable throttling valve and eotiperating With said latch device,means comprising an interrupter connected wlth said pm drum "to generateelectrical impulses and a. signal and actuating circuit comprising asignal device and said.

actuating contact to transmit stronger electrical impulses. to the linewhen; said actuat ing contact is operated.

15. In telegraph transmitter apparatus, a

pin drum. a latch device-cotiperating with said pin drum, a pneumaticcushioning device connected with said latch device, said cushioningdevice comprising a cushioning cylinder and means to adjust the actionof said cushioning cylinder, an actuating contact-coiiperatlng the saidlatch devlce to be operated thereby when said latches are operated andmeans comprising an interrupter connected with said pin drum and saidactuating. contact to generate electrical impulses. v

16. Intelegraph transmitter apparatus, a pindrum, a latch device'coiiperating' With said pin drum, a pneumatic cushioning deviceconnected with said latch, device, said cushioning deviceicomprising acushioning cylinder having an adjustable throttling valve to govern itsaction, an actuating contact cooperating the said latch'device to be isoperated thereby when said latc'hes are oper ated and means comprlsingan interrupter connected withsald pin drum and said actus .ating contactto generate electrical impulses.

. HARRY G. DAVIS. Witnesses:

Finn). WV. Cassm'r,

. ALLAN J. CASSIDY.

